1. Test the hypothesis that the random sample 12-1 12-3 118 119 12.8 12.4 came from a normal population with mean 12-0. The standard devia- tion of the measurements is known to be 0.4. Also construct a 95 per cent confidence interval for the true mean,

Q: 6. A random sample of 22 lawn mowers was selected, and the motors were tes to see how many miles per…

A:

Q: Calculate a 95% upper confidence bound for the mean of a normally distributed population using the…

A: given data  x¯ = 39316n = 14σ= 3276normal distribution 95% upper confidence bound = ?

Q: Suppose a sample of 30 Statistics students are given an IQ test. If the sample has a standard…

A: Given n=30, sample standard deviations s=12.23

Q: A die is biased. The mean and variance of a random sample of 70 scores on this die are found to be…

A:

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 12 for the population…

A: Givenstandard deviation(σ)=12Marign of error(E)=7c=99%α=1-0.99=0.01α2=0.005zα2=z0.005=2.5758   (from…

Q: A sample of 25 observations is taken from a normal distribution with unknown mean. The sample mean…

A:

Q: Q. No. 3. Forty-two items are randomly selected from a population of 500 items. The sample mean is…

A: It is given that, sample mean (x) = 40 Sample standard deviation (s) = 9 Sample size (n) = 42…

Q: A random sample of 100 observations produced a mean x̅ =38.5 and a standard deviation of 3.2. find a…

A: Given information Sample size(n) = 100 Sample mean x̅ =38.5 Sample standard deviation = 3.2…

Q: Q. No. 3. A. Forty-two items are randomly selected from a population of 500 items. The sample mean…

A: Given, sample size= 42 Sample mean=x¯ = 40 Sample sd= s =9 Let, population mean be μ

Q: 9A. The time to failure of 12 batteries was measured. The average time to failure of the 12…

A:

Q: A sample of 64 was taken from a population, with the mean of the sample being 25 and the standard…

A: It is given that  Sample mean = 25 Sample standard deviation = 2 Sample size = 64 Confidence level =…

Q: Suppose a sample of 30 LCC students are given an IQ test. The sample has a standard deviation of…

A: Given the following information- n=30s=12.24s2=149.82

Q: 4. Using data collected from a hypothetical study, generate a 95% confidence interval for the…

A: The objective of this question is to calculate a 95% confidence interval for the difference in mean…

Q: Measurements of the length of a random sample of 200 rods made by a certain machine  during one week…

A: Givensample size(n)=200Mean(x)=0.824standard deviation(s)=0.042α=1-0.95=0.05α2=0.025degrees of…

Q: Suppose scores on exams in Biology are normally distributed with an unknown population mean and a…

A: given data σ = 5.4n = 60 x¯ = 81find 90% ci for μ = ?

Q: Suppose we are interested to construct a 95% confidence interval of the mean exam score. A random…

A:

Q: A sample of 150 brand A light bulbs showed a mean lifetime of 1392 hours and a standard deviation of…

A: Option C is correct

Q: Find the value of ta/2 and n = 25 for the 90% confidence interval for the mean if the population…

A:

Q: 4. A sociologist discovered that an average of 7.2 jobs was held by 50 retired men during the course…

A: Sample mean x̄=7.2,n=sample size=50, population standard deviations σ=2.1  Construct 95% CI for…

Q: Suppose we gather a random sample of 20 data points. Assume the population standard deviation is 11.…

A: Given,   Sample size = 20 Sample mean = 23 Population standard deviation = 11   Since the population…

Q: A random sample of 100 is taken from a population. The sample is found to have a mean of 76.0 and…

A:

Q: A study of 100 patients with back pain reported that the mean duration of pain was 12 months. It is…

A: In question, Given that a study of 100 patients with back pain reported that the mean duration of…

Q: 2. A group of students working on their thesis took a random sample of 100 families in a certain…

A: Given Sample size=100, sample mean x̄=1146, sample standard deviations s=650  Construct 90% CI for…

Q: Suppose that a random sample of 11 scores from a population of test scores is to be used to estimate…

A: Chebyshev's rule and empirical rule and related to the proportion of data that falls with different…

Q: Find the 95% confidence interval for the variance and standard deviation of the heights of maple…

A: Construct the 95% confidence interval for the variance. Obtain the critical values. The standard…

Q: From the population of 540, a sample of 60 induvidual is taken from this sample. Tge mean is found…

A: Given: Population size, N is 540 Sample size, n is 60 Sample mean, x¯ is 6.2 Sample standard…

Q: Find the 90% confidence interval for the variance and standard deviation of the ages of students at…

A: Confidence interval: The (1-α) % confidence interval for population standard deviation is given by:

Q: A random sample of n =18 data from a normal distrinution with unknown variancex= 25.1 and s=3. 24.…

A: Givensample size(n)=18Mean(x)=25.1Variance(s2)=3.24standard deviation(s)=3.24=1.8

Q: Suppose we have data coming from 69 i.i.d observations. The sample mean is JÓ28 and the sample…

A:

Q: What is the smallest sample size required to provide a 95% confidence interval for a mean, if it…

A: We want to find the sample size  Given Margin of error=E=1 Standard deviation=σ=3 The critical value…

Q: 4) a. A group of doctors on a particular hospital identified that they attend an average of (15 +…

A: a) Given:  Sample size, n = 18×36 = 648 hoursSample mean, x=15+18 = 33Population standard deviation,…

Q: Find a 95% confidence interval that contains the population variance if a sample of 41 generates a…

A: Given : sample varience s^2=25 and sample size n=41  then to find 95% confidence interval of…

Q: Suppose a randomly selected sample of n = 69 men has a mean foot length of x = 27.9 cm, and the…

A: It is given that sample mean is 27.9 and standard deviation is 3.